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Ball for play and mathematical games, has system of hollow rails disposed at right angles with captive bodies sliding in them
Ball for play and mathematical games, has system of hollow rails disposed at right angles with captive bodies sliding in them
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机译:用于游戏和数学游戏的球,具有成直角布置的空心导轨系统,其中俘虏体在其中滑动
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摘要
In the main body (140) hollow rails (110) disposed at right angles, have bodies (120) sliding in them. They are captive in the guides (130). From the body surface, a projection (150) assists manual grip of the moving bodies.
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